隧道施工项目三隧道施工方法ProjectTunnelco.pptx

;学习目标

Learningobjectives;学习目标

Learningobjectives;一、工艺原理

Ⅰ.Processprinciple;二、施工流程

Ⅱ.Constructionprocess;第二步：左侧上台阶超前下台阶3-5m，开挖下台阶土体，并施作初期支护及侧洞临时支护，闭合成环。

Thesecondstep:Theleftupperstepis3-5maheadofthelowerstep,thesoilofthelowerstepisexcavated,andtheinitialsupportandtemporarysupportofthesidetunnelareimplementedtocloseintoaring.;第三步：左侧下台阶超前右侧导洞10-15m，施做右侧导洞拱顶小导管并注浆，开挖右侧导洞上台阶，施作初期支护及侧洞临时支护；开挖和支护方法与左侧上部导坑相同。

Thethirdstep:Theleftlowerstepis10-15maheadoftherightpilottunnel,therightpilottunnelvaultsmallconduitisconstructedandgroutingiscarriedout,therightpilottunnelisexcavatedtotheupperstep,andtheinitialsupportandtemporarysupportofthesidetunnelareconstructed;Theexcavationandsupportmethodisthesameastheleftupperheading.;第四步：右侧上台阶超前下台阶3-5m，开挖下台阶土体，并施作初期支护及侧洞临时支护，并闭合成环。

Step4:Therightupperstepis3-5Maheadofthelowerstep,thesoilofthelowerstepisexcavated,andtheinitialsupportandtemporarysupportofthesidetunnelareimplemented,andclosedintoaring.;第五步：右侧导洞下台阶超前中槽上台阶10-15m，施做中槽拱顶小导管并注浆，开挖中槽上台阶，预留核心土，施作拱部初期支护；

Thefifthstep:Thelowerstepoftherightpilottunnelis10-15maheadoftheupperstepofthemiddlegroove,thesmallconduitonthevaultofthemiddlegrooveisconstructedandgrouted,theupperstepofthemiddlegrooveisexcavated,thecoresoilisreserved,andtheinitialsupportofthearchisconstructed;;第六步：中槽上台阶超前主洞中台阶3-5m，开挖中台阶土体；

Thesixthstep:Theupperstepofthemiddlegrooveis3-5Maheadofthemiddlestepofthemaintunnel,andthesoilofthemiddlestepisexcavated;;第七步：中槽中台阶超前主洞下台阶3-5m，开挖下台阶土体，施作仰拱初期支护，初期支护全断面闭合。

Theseventhstep:Themiddlestepofthemiddlegrooveis3-5maheadofthelowerstepofthemaintunnel,thesoilofthelowerstepisexcavated,theinitialsupportoftheinvertedarchisimplemented,andthefullsectionoftheinitials